Differential noise

 
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CigarSki's AvatarCigarSki posted on
November 18, 2011, 6:58 pm
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2000 Dodge Dakota QC 4wd 4.7 auto LS Diff. 110,000 miles.

The LS diff. was replaced several years ago when parts of the "clutches"
were found laying in the housing during a routine lube change. The Diff.
appeared to be working normally and made no noise to indicate the failure.

Now, Around town / short trips, no issues. After 5 hours of highway running
it gets noisy when turning for a bit, then its fine. I'm guessing that the
lube is not holding up to prolonged use / heat.

I'm going to change the gear lube in the morning to Mobil1 LS 75w-90.  They
claim that no LS additive is required. Should I put some in anyway?

Ski


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Frank Galikanokus's AvatarFrank Galikanokus posted on
November 18, 2011, 8:55 pm
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Re: Differential noise


Who says the additive is not required?

JAM

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Wayne Sikorski's AvatarWayne Sikorski posted on
November 18, 2011, 10:12 pm
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Re: Differential noise


From the Mobil1 site:

Mobil 1 Synthetic Gear Lube LS 75W-90 contains special friction modifiers
designed for limited slip-type differentials. In most applications, the
addition of special LS (limited slip) additives is not required. For axles
requiring the highest level of limited-slip performance, OEM specific LS
additives can be added to this fluid.



 

CigarSki's AvatarCigarSki posted on
November 19, 2011, 10:58 am
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Re: Differential noise

Well, it all looked good inside, no chunks of metal or anything else on the
magnet.


Mobil1 claims not to need the LS additive and its marked as such on the
bottle. So I'll give it a shot as-is and see what happens. I can always add
the LS add. later.

 


 

Frank Galikanokus's AvatarFrank Galikanokus posted on
November 20, 2011, 6:20 pm
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Re: Differential noise


I would go with the manufacturers recommendations. I'll bet they do not
include Mobil 1 Synthetic Gear Lube.

JAM

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Steve W.'s AvatarSteve W. posted on
November 20, 2011, 8:18 pm
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Re: Differential noise


 From the factory book.

For Trac–lok™ differentials, a quantity of Mopar® Trac–lok™ lubricant
(friction modifier), or equivalent, must be added after repair service
or a lubricant change.

Fill differential with Mopar® Hypoid Gear Lubricant, or equivalent, to
bottom of the fill plug hole.   8 1/4": 4.7Pts.    9 1/4": 4.9Pts.

Trac–lok™ differential equipped vehicles should be road tested by making
10 to 12 slow figure-eight turns. This maneuver will pump the lubricant
through the clutch discs to eliminate a possible chatter noise complaint.
--
Steve W.

 

CigarSki's AvatarCigarSki posted on
November 20, 2011, 8:54 pm
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Re: Differential noise


Did just that. Smooth as silk. No noise, for now...

Ski
 


 

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